CN115523203A - Rotary vane steering engine steering oil cylinder fault isolation valve bank and rotary vane steering engine - Google Patents
Rotary vane steering engine steering oil cylinder fault isolation valve bank and rotary vane steering engine Download PDFInfo
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- CN115523203A CN115523203A CN202211116287.5A CN202211116287A CN115523203A CN 115523203 A CN115523203 A CN 115523203A CN 202211116287 A CN202211116287 A CN 202211116287A CN 115523203 A CN115523203 A CN 115523203A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/08—Steering gear
- B63H25/14—Steering gear power assisted; power driven, i.e. using steering engine
- B63H25/26—Steering engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/08—Steering gear
- B63H25/14—Steering gear power assisted; power driven, i.e. using steering engine
- B63H25/26—Steering engines
- B63H25/28—Steering engines of fluid type
- B63H25/30—Steering engines of fluid type hydraulic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The application relates to a fault isolation valve group for a steering oil cylinder of a steering engine and the steering engine, and relates to the field of control of ship steering engines, wherein the fault isolation valve group for the steering oil cylinder of the steering engine comprises a communicating component and a liquid path isolation valve; the communicating component comprises a two-way cartridge valve and a pilot reversing valve, and the two-way cartridge valve comprises a two-way valve control port, a two-way valve A oil port and a two-way valve B oil port; the two communication assemblies are provided, pilot reversing valves of the two communication assemblies are respectively arranged between working oil ports and oil drainage ports of two pump stations of the steering oil cylinder and a control port of the two-way valve, and two-way cartridge valves are respectively connected between a first working oil port and a second working oil port of the two pump stations; the liquid path isolation valve is arranged between the working oil ports of the two pump stations so as to control the on-off between the corresponding working oil ports of the two pump stations, and the hydraulic pump has the advantages of small volume, low cost and high action sensitivity. The application also relates to a rotary vane steering engine.
Description
Technical Field
The application relates to boats and ships steering wheel control field, especially relates to a change leaf steering wheel and turn rudder hydro-cylinder trouble isolation valves, and in addition, this application still relates to a change leaf steering wheel.
Background
The ship steering engine is a device which moves under the driving of hydraulic equipment to drive a ship rudder to rotate so as to control the navigation direction of a ship. In order to ensure the reliability of the operation of the steering engine, the steering engine is generally provided with two sets of hydraulic cylinders which are mutually independent, and two sets of hydraulic drive pump stations which are mutually independent are arranged, and hydraulic oil output by the pump stations drives the steering engine to rotate under the control of a hydraulic control loop. An isolation valve group is arranged between the two sets of hydraulic cylinders and the two sets of hydraulic drive pump stations, when a single fault occurs in the steering engine, the fault part can be isolated in time through adjustment of the hydraulic isolation valve group, so that the steering engine can work by using one set of hydraulic cylinders, the steering capacity of the ship can be recovered as soon as possible, and the navigation safety of the ship is guaranteed.
The ship steering engine mainly comprises a plunger type steering engine and a rotating vane type steering engine, and the rotating vane type steering engine is widely applied due to the advantages of small volume and high efficiency. A steering oil cylinder isolation valve group of a traditional steering engine is shown in figure 1, a steering engine 3 comprises a shell 31 and a rotor 32, the rotor 32 is installed in the shell 31, a cavity for containing hydraulic oil is formed between the shell 31 and the rotor 32, a fixed stop block 33 fixed on the shell 31 and a steering blade 34 fixed on the rotor 32 divide the cavity into four oil cavities, a first oil cavity 35 and a second oil cavity 36 form a set of working oil cylinder, and a third oil cavity 37 and a fourth oil cavity 38 form another set of working oil cylinder. The first pump station first working port A1 is connected with a first oil cavity 35, the first pump station second working port B1 is connected with a second oil cavity 36, the second pump station first working port A2 is connected with a third oil cavity 37, the second pump station second working port B2 is connected with a fourth oil cavity, the first pump station first working port A1 is connected with the second pump station second working port B2 through a liquid path isolation valve 2, the first pump station second working port B1 is connected with the second pump station first working port A2 through the liquid path isolation valve 2, and a hydraulic reversing valve 4 and a safety valve 5 are communicated between the first pump station first working port A1 and the first pump station second working port B1 and between the second pump station first working port A2 and the second pump station second working port B2.
When any set of working oil cylinder fails and cannot be used, the liquid path isolation valve 2 is controlled to act, the first working port A1 of the first pump station and the second working port B2 of the second pump station are cut off, the connection between the second working port B1 of the first pump station and the first working port A2 of the second pump station is cut off, meanwhile, the communicating hydraulic reversing valve 4 on the fault side is controlled to act, the first working port and the second working port of the pump station on the fault side are communicated, the pump station on the other side is used for driving the other set of working oil cylinder to work, and the working of the rotary vane steering engine is guaranteed. When the steering oil cylinder is in fault or is overloaded, and the pressure difference between the first working oil port and the second working oil port of any pump station is overlarge, the safety valve 5 is opened, so that the first working oil port is communicated with the second working oil port, the pressure of the working oil ports is reduced, and the working safety of the hydraulic circuit is ensured.
Because the flow of the hydraulic oil for driving the steering engine to work is very large, in order to ensure the reliable communication between the first working oil port and the second working oil port of the pump station, the valve port oil duct of the existing oil cylinder isolating valve group for communicating the hydraulic reversing valve 4 needs to be arranged very large, so that the space occupation and the production cost for communicating the hydraulic reversing valve 4 are greatly increased, and the action sensitivity of communicating the hydraulic reversing valve 4 is reduced. Similarly, in order to ensure reliable pressure relief of the first working oil port or the second working oil port of the pump station, the valve port oil duct of the safety valve 5 needs to be set to be large, so that the volume and the production cost of the safety valve 5 are increased, and the action sensitivity of the safety valve 5 is reduced.
Disclosure of Invention
In order to reduce the volume of hydro-cylinder isolating valve group, improve the action sensitivity of hydro-cylinder isolating valve group, this application provides a commentaries on classics vane steering engine commentaries on classics rudder hydro-cylinder trouble isolating valve group and commentaries on classics vane steering wheel.
The application provides a change vane steering wheel helm steering hydro-cylinder trouble isolation valves adopts following technical scheme:
a fault isolation valve group for a steering oil cylinder of a steering vane steering engine comprises a communicating component and a liquid path isolation valve; the two-way plug-in valves comprise two-way valve control ports, two-way valve A oil ports and two-way valve B oil ports, the two-way valve control ports are arranged on the two-way valve, the two-way valve A oil ports and the two-way valve B oil ports of the two communicating components are respectively arranged between the first working oil ports, the second working oil ports and the oil drainage ports of the two pump stations of the steering oil cylinder and the two-way valve control ports, and the two-way valve A oil ports and the two-way valve B oil ports of the two-way plug-in valves are respectively connected with the first working oil ports and the second working oil ports of the two pump stations; the hydraulic circuit isolating valve is arranged between the two working oil ports of the pump station so as to control the on-off of the two pump stations between the first working oil ports and between the second working oil ports.
By adopting the technical scheme, the large valve port area of the two-way cartridge valve can be utilized to form large communication flow between the first working oil port and the second working oil port, and the reliable communication between the first working oil port and the second working oil port is ensured; compared with the traditional communicating hydraulic reversing valve, the two-way cartridge valve has smaller volume and lower manufacturing cost under the condition of the same valve port area. The pilot reversing valve is used for controlling the two-way cartridge valve, and the control sensitivity of the two-way cartridge valve is effectively improved through a valve body structure with a smaller volume; by means of the liquid path isolation valve arranged between the two communicating assemblies, when the single-side oil cylinder of the steering oil cylinder breaks down, a connecting passage between the working oil ports of the two pump stations can be isolated, the communicating assembly on the fault side is used for controlling the first working oil port and the second working oil port of the pump station on the fault side to be communicated, the oil cylinder on the intact side can be used for driving the steering oil cylinder to work, and the navigation safety of a ship is guaranteed.
In a specific implementation, the pilot reversing valve is a two-position four-way reversing valve, the pilot reversing valve includes a valve oil inlet, a valve discharge port, a valve first oil outlet and a valve second oil outlet, the communicating component further includes a first one-way valve and a second one-way valve, inlets of the first one-way valve and the second one-way valve are respectively connected with the first working oil port and the second working oil port, outlets of the first one-way valve and the second one-way valve are mutually connected to form a one-way valve outlet connection point, the one-way valve outlet connection point is connected with the valve oil inlet, the valve discharge port is connected with the oil drain port, and the valve first oil outlet and/or the valve second oil outlet are connected with the two-way valve control port; the one-way valve outlet connection points of the two communication assemblies are connected with each other.
By adopting the technical scheme, the first check valve and the second check valve are utilized, and the larger pressure in the first working oil port and the second working oil port can be transmitted to the pilot reversing valve; the pressure of the control port of the two-way valve can be controlled by the two-position four-way reversing valve, so that the communication state between the oil port A of the two-way valve and the oil port B of the two-way cartridge valve, namely the communication state between the first working oil port and the second working oil port connected with the two-way cartridge valve, can be conveniently controlled.
In a specific embodiment, the first valve oil outlet is connected with the oil drainage port, and the second valve oil outlet is connected with the control port of the two-way valve.
By adopting the technical scheme, the pressure in the first working oil port or the second working oil port can be transmitted to the control port of the two-way valve under the condition that the pilot reversing valve is not electrified, so that the isolation between the first working oil port and the second working oil port is kept, and the heating and energy consumption of the pilot reversing valve electromagnet are reduced; by means of connection of the first oil outlet of the valve and the oil drainage port, leakage inside the pilot reversing valve can be reduced.
In a specific implementation scheme, the communication assembly further comprises a pilot overflow valve and a first throttle valve, the pilot overflow valve is connected with the first throttle valve, a connecting point between the pilot overflow valve and the first throttle valve is connected with the control port of the two-way valve, the other end of the pilot overflow valve is connected with the oil drainage port, and the other end of the first throttle valve is connected with the valve oil inlet; one communicate the subassembly two-way valve A hydraulic fluid port with correspond the pump station the first work hydraulic fluid port is connected, just two-way valve B hydraulic fluid port with the second work hydraulic fluid port is connected, another communicate the subassembly two-way valve A hydraulic fluid port with correspond the pump station the second work hydraulic fluid port is connected, just two-way valve B hydraulic fluid port with the first work hydraulic fluid port is connected.
By adopting the technical scheme, the pilot overflow valve and the first throttle valve are connected in series, when the pressure difference between the first working oil port and the second working oil port exceeds a set value, the pilot overflow valve opens the overflow, the pressure difference is generated at two ends of the first throttle valve, the pressure difference acts between the two-way valve A oil port and the two-way valve B oil port of the two-way cartridge valve of different communicating components and the two-way valve control port, the two-way cartridge valve is easier to push to open through the two-way valve A oil port, and the large-flow overflow is formed between the first working oil port and the second working oil port, so that the effect of a large-flow safety valve is formed, the traditional large-flow safety valve is omitted, and the size of the valve group is effectively reduced.
In a particular possible embodiment, the communication assembly further comprises a second throttling valve connected between the one-way valve outlet connection point and the valve oil inlet.
Through adopting above-mentioned technical scheme, utilize the second choke valve, on the one hand can increase the pressure differential between two-way valve control port and two-way valve A hydraulic fluid port or two-way valve B hydraulic fluid port when the guide's overflow valve is opened, guaranteed the reliable opening of two-way cartridge valve, on the other hand can reduce the flow that first working fluid port and second working fluid port flowed to the draining port through first check valve and second check valve when the guide's switching-over valve moved, reduce the energy loss of hydraulic oil.
In a specific implementation, the communication assembly further includes a third throttle valve and a fourth throttle valve, the third throttle valve and the fourth throttle valve are connected to each other and then connected between the pilot reversing valve and the control port of the two-way valve, and a connection point of the third throttle valve and the fourth throttle valve is connected to a connection point of the pilot overflow valve and the first throttle valve.
By adopting the technical scheme, the valve position switching of the pilot reversing valve and the impact of the opening and closing of the pilot overflow valve on the pressure of the control port of the two-way valve can be reduced by utilizing the third throttle valve and the fourth throttle valve, and the working stability of the two-way cartridge valve is ensured.
In a specific implementation scheme, the two communication assemblies are respectively a first communication assembly and a second communication assembly, the first working oil ports of the two pump stations are respectively a first working oil port of the first pump station and a first working oil port of the second pump station, and the second working oil ports of the two pump stations are respectively a second working oil port of the first pump station and a second working oil port of the second pump station; the oil port of the two-way valve A of the first communication assembly is connected with a first working oil port of the first pump station, and the oil port of the two-way valve B of the first communication assembly is connected with a second working oil port of the first pump station; and the oil port of the two-way valve A of the second communication assembly is connected with a second working oil port of the second pump station, and the oil port of the two-way valve B of the second communication assembly is connected with a first working oil port of the second pump station.
By adopting the technical scheme, when the liquid path isolation valve is in a communication state, the first working oil port of the first pump station and the first working oil port of the second pump station are ensured to be connected to the oil port A of the two-way valve of the first communication assembly; the first pump station second working oil port and the second pump station second working oil port are connected to the two-way valve A oil port of the second communication assembly, the characteristic that the two-way cartridge valve is opened is easily pushed by hydraulic oil of the two-way valve A oil port, and when the pressure of each pump station working oil port is increased, the two-way cartridge valve can be smoothly opened by using the smaller pressure difference of the two-way valve control port, so that the pressure relief of the working oil ports is realized.
In a specific implementation scheme, the hydraulic circuit isolation valve is a two-position four-way reversing valve, when the hydraulic circuit isolation valve is located at a first valve position, a first working oil port of the first pump station is communicated with a first working oil port of the second pump station, a second working oil port of the first pump station is communicated with a second working oil port of the second pump station, and when the hydraulic circuit isolation valve is located at a second valve position, the first working oil port of the first pump station and the second working oil port of the first pump station are both cut off from the first working oil port of the second pump station and the second working oil port of the second pump station.
By adopting the technical scheme, the two working oil ports of the first pump station and the two working oil ports of the second pump station can be more conveniently communicated and isolated by utilizing the two-position four-way reversing valve, so that the independent oil supply of the first pump station or the second pump station and the combined oil supply of the first pump station and the second pump station can be realized under the normal working state of the steering oil cylinder; and when the single side of the steering oil cylinder breaks down, the working oil ports of the two pump stations are separated, the working of the pump station on the fault side is stopped, oil is supplied by the pump station on the normal side, and the steering oil cylinder is driven to work, so that the safe navigation of the ship is ensured.
In a specific implementation scheme, the hydraulic circuit isolation valve is an electro-hydraulic control two-position four-way reversing valve, and a control oil port of the hydraulic circuit isolation valve is connected with working oil ports of the two pump stations.
By adopting the technical scheme, the electro-hydraulic control two-position four-way reversing valve is used as the liquid path isolating valve, the pilot electromagnetic valve in the liquid path isolating valve can be controlled to work through an electric control signal under the condition that the steering oil cylinder has a fault, the hydraulic oil of the control oil port is used for pushing the liquid path isolating valve to act, the liquid path isolating valve is cut off, and the working oil ports of two pump stations are isolated.
The application provides a commentaries on classics leaf steering wheel has adopted the commentaries on classics vane steering wheel commentaries on classics rudder hydro-cylinder trouble isolating valve group that this application provided.
Through adopting above-mentioned technical scheme, utilize the commentaries on classics rudder hydro-cylinder trouble isolating valve group of commentaries on classics vane steering engine of this application, can realize the trouble of commentaries on classics rudder hydro-cylinder with less valves volume and lower cost and keep apart and the function of relief valve to the sensitivity that the valves switched has been improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the cooperation of the pilot reversing valve and the two-way cartridge valve is utilized to replace the traditional communicated hydraulic reversing valve, and the characteristics of small volume and large flow of the two-way cartridge valve are utilized to effectively reduce the large space occupation and high manufacturing cost brought by the large-flow reversing valve;
2. the cooperation of the pilot overflow valve and the two-way cartridge valve is utilized to replace the traditional safety valve, the volume and the through flow of the pilot overflow valve are both very small, the existing two-way cartridge valve is controlled by means of the pilot overflow valve, the effect of the high-flow and large-volume safety overflow valve is realized, and the volume of the rotating vane steering engine steering oil cylinder fault isolation valve bank is further reduced;
3. because the valve core volume and the quality of the pilot reversing valve and the pilot overflow valve are smaller, the action sensitivity is lower, the action sensitivity of the rotary vane steering engine steering cylinder fault isolation valve bank is improved, the control precision of the valve bank is improved, and the energy consumption of a control structure is reduced.
Drawings
Fig. 1 is a control schematic diagram of a fault isolation valve group of a steering oil cylinder of a traditional steering vane steering engine.
Fig. 2 is a control schematic diagram of one embodiment of the fault isolation valve bank for the steering oil cylinder of the steering vane engine.
Fig. 3 is a schematic structural diagram of a valve block of an embodiment of a fault isolation valve block of a steering cylinder of a rotary vane steering engine.
Description of reference numerals: 1. a communicating component; 11. a two-way cartridge valve; 111. a two-way valve control port; 112. an oil port of the two-way valve A; 113. the oil port of the two-way valve B; 12. a pilot operated directional control valve; 13. a first check valve; 14. a second check valve; 15. a pilot overflow valve; 16. a first throttle valve; 17. a second throttle valve; 18. a third throttle valve; 19. a fourth throttle valve; 101. a first communication assembly; 102. a second communicating member; 2. a fluid path isolation valve; 3. A steering oil cylinder; 31. a housing; 32. a rotor; 33. fixing a stop block; 34. rotating the leaves; 35. a first oil chamber; 36. a second oil chamber; 37. a third oil chamber; 38. a fourth oil chamber; 4. the hydraulic reversing valve is communicated; 5. a safety valve; A. a valve first oil outlet; B. a valve second oil outlet; o, valve drain; p, a valve oil inlet; t, an oil drainage port; a1, a first working oil port of a first pump station; b1, a second working oil port of the first pump station; a2, a first working oil port of a second pump station; b2, a second working oil port of a second pump station.
Detailed Description
The following detailed description of embodiments of the present application refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present application, are given by way of illustration and explanation only, and are not intended to limit the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
In the present description, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, and therefore the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the features described.
One embodiment of a rotary vane steering engine steering cylinder fault isolation valve group of this application, as shown in fig. 2 and 3, including intercommunication subassembly 1 and liquid way isolation valve 2.
The steering oil cylinder 3 of the rotary vane steering engine comprises a shell 31 and a rotor 32, wherein the rotor 32 is installed in the shell 31 and can rotate in the shell 31. Fixed stops 33 are provided on the inner wall of the housing 31, the fixed stops 33 being generally fixed to opposite sides of the inner wall of the housing 31; the rotor 32 is provided with a rotor blade 34 on the outer side, and the rotor blade 34 may be fixed to the rotor 32 or may be formed integrally with the rotor 32, and the rotor blade 34 is also provided at a position opposite to both sides of the rotor 32. The gap between the housing 31 and the rotor 32 is partitioned into a first oil chamber 35, a second oil chamber 36, a third oil chamber 37, and a fourth oil chamber 38 isolated from each other at the fixed stopper 33 and the rotary vane 34. The first oil chamber 35, the second oil chamber 36, and the rotating vane 34 between the first oil chamber 35 and the second oil chamber 36 form one working cylinder, and the third oil chamber 37, the fourth oil chamber 38, and the rotating vane 34 between the third oil chamber 37 and the fourth oil chamber 38 form another working cylinder.
The steering cylinder 3 is supplied with oil by two pump stations, each pump station is provided with two working oil ports, namely a first working oil port and a second working oil port, the two working oil ports of the two pump stations are respectively connected to a first oil cavity 35, a second oil cavity 36, a third oil cavity 37 and a fourth oil cavity 38 of the steering cylinder 3, and the rotating blade 34 is pushed to move by controlling the oil supply and the oil return of the working oil ports, so that the rotor 32 is pushed to rotate, and the rotation of the rudder is driven by the rotation of the rotor 32. And a connecting oil path is arranged between the working oil ports of the two pump stations, so that the working oil port of any one pump station can be connected to the four oil cavities of the helm steering oil cylinder 3, the normal work of the helm steering oil cylinder 3 can be driven by any one pump station, and the normal operation of the helm steering oil cylinder 3 is guaranteed.
The hydraulic path isolation valve 2 is arranged between the working oil ports of the two pump stations, and can cut off a connecting passage between the working oil ports of the two pump stations when the steering oil cylinder 3 has a single-side fault, such as the working oil cylinder formed by the first oil chamber 35 and the second oil chamber 36 or the working oil cylinder formed by the third oil chamber 37 and the fourth oil chamber 38 fails in sealing, stop the working of the pump station connected to the working oil cylinder at the fault side, directly connect the two oil chambers of the working oil cylinder at the fault side, and work by one pump station connected to the working oil cylinder at the sound side to push the working oil cylinder at the sound side to work. Therefore, when the working oil cylinder on one side of the steering oil cylinder 3 breaks down, the steering oil cylinder 3 can be ensured to work temporarily, and the phenomenon that the steering oil cylinder 3 stops running due to the fault of the working oil cylinder on one side of the steering oil cylinder 3, and the ship sailing is out of control is avoided. The liquid path isolation valve 2 may use a hydraulic valve or a hydraulic valve group, such as a reversing valve, a switch valve, etc., capable of controlling the on/off of two oil paths simultaneously.
The communication assembly 1 comprises a two-way cartridge valve 11 and a pilot operated directional valve 12. The two-way cartridge valve 11 comprises a two-way cartridge valve cavity and a two-way cartridge valve core installed in the valve cavity, the two-way cartridge valve 11 is provided with a two-way valve control port 111, a two-way valve A oil port 112 and a two-way valve B oil port 113 which are communicated with the two-way cartridge valve cavity, the two-way cartridge valve core can cut off an oil path between the two-way valve A oil port 112 and the two-way valve B oil port 113 under the pushing of pressure oil of the two-way valve control port 111, and when the pressure of the two-way valve control port 111 is relieved, the pressure oil from the two-way valve A oil port 112 or the two-way valve B oil port 113 can easily push the two-way cartridge valve core to move, so that the two-way valve A oil port 112 is communicated with the two-way valve B oil port 113.
The pilot reversing valve 12 is arranged on a control cover plate of the cartridge two-way valve, the pilot reversing valve 12 is installed between a first working oil port, a second working oil port, an oil drain port T and a two-way valve control port 111 of the pump station, and when the pilot reversing valve 12 switches valve positions, the first cartridge control oil port 11 can be switched to be communicated with a working oil port with higher pressure in the first working oil port and the second working oil port or communicated with the oil drain port T. The working oil port with higher pressure in the first working oil port and the second working oil port can be switched to be communicated with the control port 111 of the two-way valve through a hydraulic valve group, such as a check valve group or a shuttle valve; the first working port or the second working port may be switched to communicate with the two-way valve control port 111 by switching the valve position of the multi-position directional control valve. When the first working oil port or the second working oil port is communicated with the control port 111 of the two-way valve, the pressure of hydraulic oil in the control port 111 of the two-way valve is higher, and the two-way plug-in valve core is pushed to cut off an oil path between the oil port 112 of the two-way valve A and the oil port 113 of the two-way valve B; when the two-way valve control port 111 is communicated with the oil drainage port T, the pressure of hydraulic oil in the two-way valve control port 111 is relieved, and the lower pressure in the oil port A112 of the two-way valve or the oil port B113 of the two-way valve can push the two-way plug-in valve element, so that the oil port A112 of the two-way valve is communicated with the oil port B113 of the two-way valve.
The number of the communicating assemblies 1 is two, the two communicating assemblies 1 are respectively arranged between the first working oil ports and the second working oil ports of the two pump stations, and the two-way valve A oil port 112 and the two-way valve B oil port 113 of the two-way cartridge valve 11 are respectively connected with the first working oil port and the second working oil port of the corresponding pump station. When a working oil cylinder on one side of the steering oil cylinder 3 breaks down and the hydraulic isolating valve acts to cut off the connection between the working oil ports of the two pump stations, the pump station connected with the working oil cylinder which breaks down stops working, the pilot reversing valve in the communicating component connected between the two working oil ports of the pump station is controlled to act, the two-way valve control port 111 of the corresponding two-way cartridge valve 11 is connected with the oil drainage port T, so that the valve core of the two-way cartridge valve 11 can be pushed by small pressure in the oil port 112 of the two-way valve A or the oil port 113 of the two-way valve B, the first working oil port of the pump station on the fault side is communicated with the second working oil port, and the two oil cavities of the working oil cylinder which breaks down are also communicated. Therefore, the pump station connected with the working cylinder on the side without the fault of the steering oil cylinder 3 can drive the working cylinder on the side without the fault of the steering oil cylinder 3 to work, and the rotor 32 is pushed to rotate to drive the ship rudder to work temporarily, so that the ship navigation is prevented from being out of control. Since the two oil chambers of the malfunctioning working cylinder communicate with each other when the rotor 32 rotates, hydraulic oil in the two oil chambers can freely flow, so that the malfunctioning working cylinder can be prevented from becoming an obstacle to the operation of the non-malfunctioning working cylinder.
In some embodiments of the fault isolation valve group for the steering oil cylinder of the rotary vane steering engine, as shown in fig. 2 and 3, the pilot directional valve 12 is a two-position four-way directional valve, specifically, four oil ports of the pilot directional valve 12 are a valve oil inlet P, a valve discharge port O, a valve first oil outlet a and a valve second oil outlet B, respectively; a first check valve 13 and a second check valve 14 are also provided in the communication assembly 1. An inlet of the first check valve 13 is connected with any one of the first working oil port and the second working oil port, an inlet of the second check valve 14 is connected with the other one of the first working oil port and the second working oil port, outlets of the first check valve 13 and the second check valve 14 are connected with each other to form a check valve outlet connection point, and thus, the pressure of the oil port with higher pressure in the first working oil port and the second working oil port can be transmitted to the check valve outlet connection point. A valve oil inlet P of the pilot reversing valve 12 is connected to a one-way valve outlet connection point, a valve discharge port O is connected to an oil drain port T, and at least one of a valve first oil outlet A and a valve second oil outlet B is connected with a two-way valve control port 111, so that higher pressure in a first working oil port and a second working oil port can be transmitted to the two-way valve control port 111 through valve position switching of the pilot reversing valve 12; or the two-way valve control port 111 is connected to the drain port T, and the two-way valve control port 111 is depressurized. The one-way valve outlet connection points of the two communication assemblies 1 are connected with each other, so that the pressure of the one-way valve outlet connection points of the two communication assemblies 1 can be maintained to be the highest pressure in the first working oil ports and the second working oil ports of the two pump stations.
In a preferred embodiment of the fault isolation valve group of the steering cylinder of the rotary vane steering engine, as shown in fig. 2 and 3, the pilot directional valve 12 uses a two-position four-way electromagnetic directional valve. When the pilot reversing valve 12 is not powered and is in the initial valve position, the valve oil inlet P is communicated with the valve second oil outlet B, at this time, higher pressures of the first working oil ports and the second working oil ports of the two pump stations are applied to the two-way valve control port 111 to push the valve core of the two-way cartridge valve 11 to act, the connection between the oil port 112 of the two-way valve a and the oil port 113 of the two-way valve B is cut off, and hydraulic oil supplied through the working oil ports of the pump stations enters the working oil cylinder of the steering oil cylinder 3 to push the steering oil cylinder 3 to operate.
In some embodiments of the fault isolation valve group for the steering cylinder of the steering vane engine, as shown in fig. 2 and 3, a pilot overflow valve 15 and a first throttle valve 16 are further arranged in the communication assembly 1. One end of the first throttle valve 16 is connected with the outlet connection point of the one-way valve, namely, the valve oil inlet P, the other end of the first throttle valve 16 is connected with the pilot overflow valve 15, and the other end of the pilot overflow valve 15 is connected with the oil drainage port T, namely, the valve discharge port O; a connection point of the first throttle valve 16 and the pilot relief valve 15 is connected to the two-way valve control port 111. In the two communicating assemblies 1, the two-way valve A oil port 112 of the two-way cartridge valve 11 in one communicating assembly 1 is connected with the first working oil port of the corresponding pump station, the two-way valve B oil port 113 is connected with the second working oil port of the pump station, the two-way valve A oil port 112 of the two-way cartridge valve 11 in the other communicating assembly 1 is connected with the second working oil port of the corresponding pump station, and the two-way valve B oil port 113 is connected with the first working oil port of the pump station.
When the pressure of any one of the first working oil port and the second working oil port of the two pump stations exceeds the overflow pressure of the pilot overflow valve 15, the pilot overflow valve 15 is opened, the hydraulic oil flows from the working oil port with higher pressure to the oil drain port T through the corresponding check valve, the first throttle valve 16 and the pilot overflow valve 15, the flowing hydraulic oil generates a pressure difference between the front and rear of the first throttle valve 16, and the pressure difference is simultaneously applied between the two-way valve a oil port 112 or the two-way valve B oil port 113 (the oil port connected with the working oil port with higher pressure) of the two-way cartridge valve 11 and the two-way valve control port 111. The pressure applied between the two-way valve B port 113 of the two-way cartridge valve 11 in one communication block 1 and the two-way valve control port 111 is inevitably applied between the two-way valve a port 112 of the two-way cartridge valve 11 in the other communication block 1 and the two-way valve control port 111. The area of the hydraulic oil in the oil port 112 of the two-way valve a of the two-way cartridge valve 11 acting on the valve core is larger, and the valve core is easier to push to move, so that compared with the oil port 113 of the two-way valve B, the pressure of the hydraulic oil in the oil port 112 of the two-way valve a pushing the valve core of the two-way cartridge valve 11 to open is lower, the hydraulic oil in the working oil ports with higher pressure in the first working oil port and the second working oil port of the pump station firstly pushes the valve core of the two-way cartridge valve 11 to open through the oil port 112 of the two-way valve a connected with the hydraulic oil ports, and the hydraulic oil flows to the working oil port with lower pressure from the working oil port with higher pressure in the first working oil port and the second working oil port of the pump station. Because the valve port flow area of the two-way cartridge valve 11 is large, the hydraulic oil pressure of the pump station working oil port can be obviously reduced due to large discharge flow, when the pressure of the pump station working oil port is reduced to the overflow pressure of the pilot overflow valve 15, the pilot overflow valve 15 is closed, the pressure difference between the front and the back of the first throttle valve 16 disappears, and the two-way cartridge valve 11 is closed. Therefore, the pressure of the first working oil port and the second working oil port of the pump station can be limited under the overflow pressure of the pilot overflow valve 15, and the safety of the valve group and the connection oil circuit of the valve group are guaranteed.
In a preferred embodiment of the fault isolation valve group for the steering cylinder of the steering vane engine, as shown in fig. 2 and 3, a second throttle valve 17 is further arranged in the communication assembly 1. The second throttle valve 17 is connected between the one-way valve outlet connection point and the valve oil inlet P of the pilot operated directional control valve 12, when the pilot operated directional control valve 12 operates and the valve oil inlet P is communicated with the oil drain port T, hydraulic oil flows through the second throttle valve 17 and the valve port of the pilot operated directional control valve 12 from the one-way valve outlet connection point and flows to the oil drain port T, a pressure difference is generated before and after the second throttle valve 17, the pressure of the valve oil inlet P, namely the pressure at the front end of the first throttle valve 16, and the reliable reduction of the pressure of the control port 111 of the two-way valve is ensured. On the other hand, when the pilot relief valve 15 is opened, the hydraulic oil is relieved through the second throttle valve 17 and the first throttle valve 16 in succession, and a greater pressure difference is applied to the two-way cartridge 11, so that the two-way cartridge 11 is more easily opened.
In some embodiments of the fault isolation valve set for the steering cylinder of the rotary vane steering engine according to the present application, as shown in fig. 2 and 3, a third throttle valve 18 and a fourth throttle valve 19 are further disposed in the communication assembly 1. One end of the third throttle valve 18 is connected to an oil outlet of the pilot reversing valve 12 connected to the two-way valve control port 111, for example, a second valve oil outlet B, and the other end is connected to a connection point of the first throttle valve 16 and the pilot overflow valve 15. One end of the fourth throttle valve 19 is connected to the two-way valve control port 111, and the other end is connected to a connection point of the first throttle valve 16 and the pilot relief valve 15, that is, to the third throttle valve 18. The third throttle valve 18 and the fourth throttle valve 19 are arranged to reduce the impact of the pressure change of the hydraulic oil on the control port 111 of the two-way valve when the valve position of the pilot reversing valve 12 is switched or the pilot overflow valve 15 is opened and closed, thereby ensuring the reliable operation of the two-way cartridge valve 11.
As a specific implementation of the vane steering engine steering cylinder fault isolation valve group of this application, as shown in fig. 2 and fig. 3, two pump stations for steering cylinder oil supply are first pump station and second pump station respectively, two working oil ports of the first pump station are first pump station first working oil port A1 and first pump station second working oil port B1 respectively, and two working oil ports of the second pump station are second pump station first working oil port A2 and second pump station second working oil port B2 respectively. The two communication assemblies 1 are respectively a first communication assembly 101 and a second communication assembly 102, wherein a two-way valve A oil port 112 of a two-way cartridge valve 11 in the first communication assembly 101 is connected with a first pump station first working oil port A1, and a two-way valve B oil port 113 is connected with a first pump station second working oil port B1; the two-way valve A oil port 112 of the two-way cartridge valve 11 in the second communication assembly 102 is connected with the second pump station second working oil port B2, and the two-way valve B oil port 113 is connected with the second pump station first working oil port A2. Therefore, when the pressures of the first pump station first working oil port A1 and the second pump station first working oil port A2 are too high, so that the pilot overflow valve 15 is opened, the hydraulic oil in the first pump station first working oil port A1 and the second pump station first working oil port A2 can easily push the two-way cartridge valve 11 in the first communication assembly 101 to be opened through the two-way valve a oil port 112, and when the pressures of the first pump station second working oil port B1 and the second pump station second working oil port B2 are too high, the hydraulic oil in the first pump station second working oil port B1 and the second pump station second working oil port B2 can easily push the two-way pump station cartridge valve 11 in the second communication assembly 102 to be opened through the two-way valve a oil port 112, so that the limitation on the pressures of the two working oil ports is more reliable.
In some embodiments of the vane steering engine steering cylinder fault isolation valve group of this application, as shown in fig. 2 and fig. 3, the liquid path isolation valve 2 is a two-position four-way reversing valve, the liquid path isolation valve 2 sets up to, when this two-position four-way reversing valve is located first valve position, first pump station first working oil port A1 is linked together with second pump station first working oil port A2, and first pump station second working oil port B1 is linked together with second pump station second working oil port B2, at this moment, no matter first pump station works alone, second pump station works alone or first pump station and second pump station work simultaneously, two working cylinders of steering cylinder 3 can all be carried simultaneously to hydraulic oil, guarantee the steady, reliable operation of steering cylinder 3. When the two-position four-way reversing valve is located at the second valve position, the first working oil port A1 of the first pump station, the first working oil port A2 of the second pump station and the second working oil port B2 of the second pump station are in a cross state, and the second working oil port B1 of the first pump station, the first working oil port A2 of the second pump station and the second working oil port B2 of the second pump station are also in a stop state. Therefore, one pump station can work to drive one corresponding working oil cylinder to work, hydraulic oil in one working oil cylinder cannot flow into the other working oil cylinder, and isolation of hydraulic oil output by the two pump stations and isolation of hydraulic oil in the two working oil cylinders are achieved.
In a preferred embodiment of the fault isolation valve group for the steering oil cylinder of the rotary vane steering engine, as shown in fig. 2 and 3, the hydraulic path isolation valve 2 is an electro-hydraulic control two-position four-way reversing valve, a control oil port of the hydraulic path isolation valve 2 is connected with working oil ports of two pump stations through a single valve group or a shuttle valve group, and higher pressure in the working oil ports of the two pump stations is transmitted to the control oil port of the hydraulic path isolation valve 2. When the liquid path isolation valve 2 is not powered on, the two-position four-way reversing valve is in an initial first valve position; when the liquid path isolation valve 2 is electrified, a pilot electromagnetic valve in the two-position four-way reversing valve is controlled by electricity and the pressure of a control oil port of the liquid path isolation valve 2 is utilized to push the two-position four-way reversing valve to be switched to a second valve position. The electro-hydraulic control two-position four-way reversing valve is more convenient to control, valve position switching is more reliable, the valve position is not powered to be arranged at the first valve position, the liquid path isolation valve 2 is not powered under a normal working state, heating cannot be generated, energy consumption of the liquid path isolation valve 2 is reduced, and the service life of the liquid path isolation valve 2 is prolonged.
The rotating vane steering engine uses the rotating vane steering engine rotating vane oil cylinder fault isolation valve bank of any embodiment of the application, so that the isolation of oil ways on two sides is guaranteed when the single side of the rotating vane oil cylinder has a fault with smaller volume and lower cost, the rotating vane steering engine is guaranteed not to be stopped due to the single side fault of the rotating vane oil cylinder, the working pressure of the valve bank can be limited, and the safe work of the valve bank is guaranteed.
In the description of the present invention, reference to the description of "one embodiment," "a specific embodiment," "a preferred embodiment," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present disclosure, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides a change vane steering wheel helm steering hydro-cylinder trouble isolation valves which characterized in that: comprises a communication component (1) and a liquid path isolation valve (2); the communication assembly (1) comprises a two-way cartridge valve (11) and a pilot reversing valve (12), wherein the two-way cartridge valve (11) comprises a two-way valve control port (111), a two-way valve A oil port (112) and a two-way valve B oil port (113); the two communication assemblies (1) are provided, the pilot reversing valves (12) of the two communication assemblies (1) are respectively arranged between a first working oil port, a second working oil port and an oil drainage port (T) of two pump stations of a steering oil cylinder and the control port (111) of the two-way valve, and the oil port A (112) of the two-way valve and the oil port B (113) of the two-way valve (11) are respectively connected with the first working oil port and the second working oil port of the two pump stations; the liquid path isolation valves (2) are arranged between the working oil ports of the two pump stations so as to control the on-off of the two pump stations between the first working oil ports and between the second working oil ports.
2. The rotary vane steering engine helm steering oil cylinder fault isolation valve group of claim 1, which is characterized in that: the pilot reversing valve (12) is a two-position four-way reversing valve, the pilot reversing valve (12) comprises a valve oil inlet (P), a valve discharge port (O), a valve first oil outlet (A) and a valve second oil outlet (B), the communicating component (1) further comprises a first one-way valve (13) and a second one-way valve (14), inlets of the first one-way valve (13) and the second one-way valve (14) are respectively connected with the first working oil port and the second working oil port, outlets of the first one-way valve (13) and the second one-way valve (14) are mutually connected to form a one-way valve outlet connection point, the one-way valve outlet connection point is connected with the valve oil inlet (P), the valve discharge port (O) is connected with the oil drainage port (T), and the valve first oil outlet (A) and/or the valve second oil outlet (B) are/is/are connected with the two-way valve control port (111); the one-way valve outlet connection points of the two communication assemblies (1) are connected with each other.
3. The rotary vane steering engine helm steering oil cylinder fault isolation valve bank according to claim 2, characterized in that: the first valve oil outlet (A) is connected with the oil drainage port (T), and the second valve oil outlet (B) is connected with the control port (111) of the two-way valve.
4. The rotary vane steering engine helm steering oil cylinder fault isolation valve bank according to claim 2, characterized in that: the communication assembly (1) further comprises a pilot overflow valve (15) and a first throttle valve (16), the pilot overflow valve (15) is connected with the first throttle valve (16), a connecting point between the pilot overflow valve and the first throttle valve is connected with the two-way valve control port (111), the other end of the pilot overflow valve (15) is connected with the oil drainage port (T), and the other end of the first throttle valve (16) is connected with the valve oil inlet (P); one communicate subassembly (1) two-way valve A oil port (112) with correspond the pump station first work oil port is connected, just two-way valve B oil port (113) with the second work oil port is connected, another communicate subassembly (1) two-way valve A oil port (112) with correspond the pump station the second work oil port is connected, just two-way valve B oil port (113) with first work oil port is connected.
5. The rotary vane steering engine helm steering oil cylinder fault isolation valve bank according to claim 4, characterized in that: the communication assembly (1) further comprises a second throttle valve (17), and the second throttle valve (17) is connected between the one-way valve outlet connection point and the valve oil inlet (P).
6. The fault isolation valve group for the steering oil cylinder of the rotary vane steering engine according to claim 4, which is characterized in that: the communication assembly (1) further comprises a third throttle valve (18) and a fourth throttle valve (19), the third throttle valve (18) and the fourth throttle valve (19) are connected with each other and then connected between the pilot reversing valve (12) and the two-way valve control port (111), and a connection point of the third throttle valve (18) and the fourth throttle valve (19) and a connection point of the pilot overflow valve (15) and the first throttle valve (16).
7. The rotary vane steering engine helm steering oil cylinder fault isolation valve bank according to any one of claims 1 to 6, which is characterized in that: the two communication assemblies (1) are respectively a first communication assembly (101) and a second communication assembly (102), the first working oil ports of the two pump stations are respectively a first pump station first working oil port (A1) and a second pump station first working oil port (A2), and the second working oil ports of the two pump stations are respectively a first pump station second working oil port (B1) and a second pump station second working oil port (B2); the two-way valve A oil port (112) of the first communication assembly (101) is connected with the first working oil port (A1) of the first pump station, and the two-way valve B oil port (113) of the first communication assembly (101) is connected with the second working oil port (B1) of the first pump station; the two-way valve A oil port (112) of the second communication assembly (102) is connected with the second pump station second working oil port (B2), and the two-way valve B oil port (113) of the second communication assembly (102) is connected with the second pump station first working oil port (A2).
8. The rotary vane steering engine helm steering oil cylinder fault isolation valve group of claim 7, which is characterized in that: the hydraulic circuit isolating valve (2) is a two-position four-way reversing valve, when the hydraulic circuit isolating valve (2) is located at a first valve position, a first pump station first working oil port (A1) is communicated with a second pump station first working oil port (A2), a first pump station second working oil port (B1) is communicated with a second pump station second working oil port (B2), when the hydraulic circuit isolating valve (2) is located at a second valve position, the first pump station first working oil port (A1) and the first pump station second working oil port (B1) are both cut off with the second pump station first working oil port (A2) and the second pump station second working oil port (B2).
9. The fault isolation valve group for the steering oil cylinder of the rotary vane steering engine according to claim 8, which is characterized in that: the hydraulic circuit isolation valve (2) is an electro-hydraulic control two-position four-way reversing valve, and control oil ports of the hydraulic circuit isolation valve (2) are connected with working oil ports of the two pump stations.
10. The utility model provides a change leaf steering wheel which characterized in that: the fault isolation valve bank of the steering oil cylinder of the rotary vane steering engine according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211116287.5A CN115523203B (en) | 2022-09-14 | 2022-09-14 | Rotary vane steering engine rudder oil cylinder fault isolation valve group and rotary vane steering engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211116287.5A CN115523203B (en) | 2022-09-14 | 2022-09-14 | Rotary vane steering engine rudder oil cylinder fault isolation valve group and rotary vane steering engine |
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| CN115523203A true CN115523203A (en) | 2022-12-27 |
| CN115523203B CN115523203B (en) | 2023-09-15 |
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| CN202211116287.5A Active CN115523203B (en) | 2022-09-14 | 2022-09-14 | Rotary vane steering engine rudder oil cylinder fault isolation valve group and rotary vane steering engine |
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| CN112610554A (en) * | 2020-12-05 | 2021-04-06 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | High-reliability graded-control rotary-vane type steering engine device |
| CN113638929A (en) * | 2021-09-13 | 2021-11-12 | 无锡市东舟船舶设备股份有限公司 | Compact type valve bank special for steering engine |
| CN113669322A (en) * | 2021-09-13 | 2021-11-19 | 无锡市东舟船舶设备股份有限公司 | Special valve bank for large-flow steering engine |
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- 2022-09-14 CN CN202211116287.5A patent/CN115523203B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130029750A (en) * | 2011-09-15 | 2013-03-25 | 훌루테크 주식회사 | The steering apparatus of a vessel |
| CN102923291A (en) * | 2012-11-21 | 2013-02-13 | 武汉船用机械有限责任公司 | Hydraulic control valve unit for rotating-vane type steering engine |
| CN105465089A (en) * | 2015-12-25 | 2016-04-06 | 中国船舶重工集团公司第七0四研究所 | Steering engine isolating bypass valve group |
| CN108778925A (en) * | 2016-02-22 | 2018-11-09 | 三菱重工业株式会社 | Hydraulic steering gear and ship |
| CN112610554A (en) * | 2020-12-05 | 2021-04-06 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | High-reliability graded-control rotary-vane type steering engine device |
| CN113638929A (en) * | 2021-09-13 | 2021-11-12 | 无锡市东舟船舶设备股份有限公司 | Compact type valve bank special for steering engine |
| CN113669322A (en) * | 2021-09-13 | 2021-11-19 | 无锡市东舟船舶设备股份有限公司 | Special valve bank for large-flow steering engine |
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| CN115523203B (en) | 2023-09-15 |
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